Fallout.... set in Australia! 
Think about it. Completely new avenues of lore to explore, completely new wastelands to scrounge. I mean as much as the series has "homaged" to Mad Max, might as well take it full circle and set on there.  Drive nuclear powered Rovers across the wastes, fight along side power-armored ASAS troops, loot jars of Vegemite off of corpses to regain HP, find Quigly's rifle as a Unique. 
Shit, think of all the creatures right now living in the land down under that can kill you. Now imagine gigantic, radioactive pants-shittingly scary versions of them. Radioactive drop bears, gator-lurks, beasts that look like Cthulu fucked a pit viper, giant two-headed baby-stealing dingos, thylacine's that can swallow you whole!
It's not like the aussie government's track record couldn't be satired equally like the US's is in the current fallout series, or have their own vault's run by the AU branch of Vault Tech. 
 
What do you guys think? Crazy fever dream, or awesome sauce?